| Description | Tumbling "E" charts, also known as Illiterate "E" charts, feature the use of only one optotype. This makes testing illiterate and mute patients easier. The patient only has to gesture the direction they see the "E" facing. Also the design of the "E" | Tumbling "E" charts, also referred to as Illiterate "E" tests, are useful for testing patients that are illiterate or mute. Patients simply have to sign or gesture which direction they see the "E" facing. Tumbling "E" charts are considered highly |